Hermann schultz



Oct. 22, 1929. H. scHuLTz OLD FOR ALUMINOTHERMIC WELDING 01'- !AIDS Filed Dec. o, 1925 R HIS ATTORNEY ;i NVENTO BY cu Patented Oct. 22, 1929 UNITED STATES HERMANN SCHULTZ, OF BERLIN-LANKXVITZ, GERMANY MOLD FOR ALUMINOTHERMIC VIELDING OF RAILS Application filed December 10, 1928, Serial No. 324329, and in Germany January 26, 1928.

in the welding of rails by the aluminothernic methoch which involves the pouring or" superheated molten metal into a mold enclosing the rail ends and providing a space substantially surrounding the ends of the rails at the top, bottom and sides, it is important to so distribute the molten aluminothernic metal in the mold that the temperature oi the metal shall be as uniform as possible wherever said metal engages the surfaces of the rails to be melted or fused. This has been practically impossible of attainment in the usual standard types of molds employed 'or this work in which the pouring gates are arranged in the top of the molds and are usually biturcated or branched to drect the molten metal into the spaces on each side Ott' the rails, so that the molten metal first comes in contact with the rail heads where it gives up a relatively large quantity of heat, the loss frequently being su'ficient to prevent the first portion ot the pour retaining suficieut heat to nelt or fuse those portions of the rail with which it cones into final conta ctv In other words, the first portion of the molten metal is obliged to traverse the full depth of the mold cavity in contact with the rails to be welded, so that it gives up much of its heat to the upper portion of the 'rails before reaching the flanges or bases of the rails which it is intended to heat to welding or 'Fusion temperature, in which event it is frequently difficult or impossible to obtain a satisfactory welding of the rail bases or fianges.

The present inventon is designed to provide a special form of mold to correct this clifiiculty and to insure the superheated molten metal reaching all parts of the rail 40 ends to be tused or welded, at substantially the same uniform temperature. The invention is illustrated in the accompanying drawings, in which Fig. 1 is a vertical transverse section through a mold .involving the new structural features.

Fig. 2 is a horizontal section on line %2 of Fig. 1.

Referring to the drawing F-F represente the two sections of t e nold, forme@ of the usual refractory material, adapted to be clamped about the ends of the rails S-S, which are to be welded together, said mold including a central pouring gate b, which is branches or biturcated at its bottom into 5 Channels c, 0', which direct the molten metal into the mold cavity to each side of the rail heads, whence it would flow normally in contact with the rail ends through the spaces a, a and ultimately reach the space e, e surround- 9 ing the bases or fianges of the rails,' with the result that a material part otthe superheat of the poured metal would be lost to the upper portions of the rail ends. In order to overcome this dificulty and to insure that the 05 temperature of the nolten metal reaching the bases or fianges of the rails shall be of suflicient temperature to tuse or weld the rail flanges together, there are provided in the body of the mold auxiliary Channels d, d', which connect the space or portion of the nold cavity adjacent the rail heads directly with the portion of the mold cavity adjacent and surrounding the rail bases or llanges the said channels being preferably substantially vertical, so that the first portion of the molten metal pourcd into the mold will dividc at the bottom of the pouring gate, be diverted by the Channels 0. c' laterally toward the sides of the mold cavity adjacent the rail heads, Q will contact the rail heads'only over a limited area and will then pass down the ehannels d, d' directly into the portion of the mold cavity e surrounding the bases or fianges of the rails, with a minimum loss ot heat.

What I claim is:

1. A mold for alumino-thermic welding of rails, in which the portion of the mold cavity adjacent the rail heads is connected to the portion of the cavity adjacent the rail bases by direct channels formed within the body of the mold.

2. A mold for alumino-thermic welding of rails, in which the portion of the mold cavity adjacent the rail heads is connected to the portion of the cavity adjacent the rail bases by direct substantially vertical Channels formed within the body of the mold.

3. A mold for alumino thermic welding of ra s Geremi-Si e; a post ng gate located cen 109 trally of the top of the mold With dvergent Channels d'eoted toward the sdes of the mold cavty surrounding the rail ends, and auxla'y Channels formed and enclosed wthin the body of the mold connectng the mold cavty adjacent the rail heads with the mold cavty adjacent theral bases.

In testmony Whe' of I my signature.

HERMANN SCHULTZ. 

